I wouldn't take the 2CV as an example of suspension that modern cars don't match, but Citroën's later hydropneumatic suspension[1] are indeed unmatched.

[1]: https://www.youtube.com/watch?v=HKyWKKs4ISo

Those were amazing! But also Bose made some incredible electro magnetic suspension system, which might see the commercial usage only now:

https://www.autoevolution.com/news/this-is-how-bose-s-failed...

>Citroën's later hydropneumatic suspension[1] are indeed unmatched

Yes, and ask yourself why they aren't making it anymore. Answer: cost and reliability, which is also a function of cost.

ClearMotion has the Bose technology now and apparently is productizing it again.

my father owned a series of CXs with that suspension and it was magic. the car went round corners like it was on rails - completely flat